anhydrite evaporite

anhydrite evaporite

[an′hī‚drīt i′vap·ə‚rīt]
(petrology)
CuSO4 A sedimentary rock composed chiefly of copper sulfate in compact granular form deposited by evaporation of water; resembles marble and differs from gypsum in lack of water of hydration and hardness.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.